<?php
/**
  * wechat php test
  * update time: 20141008
  */

//define your token
define("TOKEN", "WEIXIN_TEST");
$wechatObj = new wechatCallbackapiTest();
$wechatObj->valid();
$wechatObj->responseNews();
exit;

class wechatCallbackapiTest
{
    public function valid()
    {
        $echoStr = $_GET["echostr"];

        //valid signature , option
        if($this->checkSignature()){
            echo $echoStr;
            //exit;
        }
    }

    public function responseMsg()
    {
        //get post data, May be due to the different environments
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

        //extract post data
        if (!empty($postStr)){
                
                $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
                $keyword = trim($postObj->Content);
                $time = time();
                $textTpl = "<xml>
                            <ToUserName><![CDATA[%s]]></ToUserName>
                            <FromUserName><![CDATA[%s]]></FromUserName>
                            <CreateTime>%s</CreateTime>
                            <MsgType><![CDATA[%s]]></MsgType>
                            <Content><![CDATA[%s]]></Content>
                            <FuncFlag>0</FuncFlag>
                            </xml>";             
                if(!empty( $keyword ))
                {
                    $msgType = "text";
                    $contentStr = "欢迎关注本公众号"."\n";
                    $contentStr .= "Welcome to wechat world!";
                    $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                    echo $resultStr;
                }else{
                    echo "Input something...";
                }

        }else {
            echo "";
            exit;
        }
    }
     public function responseNews()
    {
        //get post data, May be due to the different environments
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

        //extract post data
        if (!empty($postStr)){
                
                $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
                $keyword = trim($postObj->Content);
                $time = time();
                $textTpl = "<xml>
                            <ToUserName><![CDATA[%s]]></ToUserName>
                            <FromUserName><![CDATA[%s]]></FromUserName>
                            <CreateTime>%s</CreateTime>
                            <MsgType><![CDATA[%s]]></MsgType>
                            <ArticleCount>1</ArticleCount>
                            <Articles>
                            <item>
                            <Title><![CDATA[%s]]></Title>
                            <Description><![CDATA[%s]]></Description>
                            <PicUrl><![CDATA[%s]]></PicUrl>
                            <Url><![CDATA[%s]]></Url>
                            </item>
                            </Articles>
                            </xml>";  

//------------------------------订阅事件-----------------------------------------------

         if($postObj->MsgType == 'event' && $postObj->Event == 'subscribe'){

               
                 
                    $title = '感谢您关注本公众号';
                    $Description = '感谢您关注本公众号，回复【xxx】发现更多精彩！';
                    $image_url = 'http://images.91160.com/news/other/201503/2015031811490870043.png';

           
            }

//---------------------------------end-------------------------------------------------

 //------------------------------获取用户地理位置事件-----------------------------------------------

         if($postObj->MsgType == 'event' && $postObj->Event == 'LOCATION'){

               
                 
                    $title = '获取用户地理位置';
                    $Description = '经度:'.$postObj->Longitude.'   纬度:'.$postObj->Latitude."   精确度：".$postObj->Precision."\n";
                    $image_url = 'http://ugc.qpic.cn/baikepic2/1581/cut-20140922150532-1321983661.jpg/0';

           
            }

//---------------------------------end-------------------------------------------------
               
                    $msgType = "news";
                    $Url    = "http://m.focus.cn";
                    $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $title,$Description,$image_url,$Url);
                    echo $resultStr;
                    exit;

        }else {
            echo "";
            exit;
        }
    }   
    private function checkSignature()
    {
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];
        $token = TOKEN;
        $tmpArr = array($token, $timestamp, $nonce);
        sort($tmpArr, SORT_STRING);
        $tmpStr = implode( $tmpArr );
        $tmpStr = sha1( $tmpStr );
        
        if( $tmpStr == $signature ){
            return true;
        }else{
            return false;
        }
    }
}

?>